(a) Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?
(b) Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common?
(a) Lithium, sodium and potassium all belong to the same group. The atoms of lithium, sodium and potassium all have only one electron in their outermost shells and all of these are metals. All of these react with water to form alkalies.
(b) The atoms of helium and neon have their outermost shells completely filled. Helium has its first shell completely filled, while neon has its first and second shells (K and L) completely filled.
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- (a) How does the atomic size vary on going down from top to bottom in a group of the periodic table? Why does it vary this way?(b) Lithium, sodium and potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements? Explain your answer.
- (a) Why does the size of the atoms progressively become smaller when we move from sodium (Na) to chlorine (Cl) in the third period of the periodic table?(b) Helium and neon are unreactive gases. What, if anything, do their atoms have in common?
- (a)Explain why, metals usually do not liberate hydrogen gas with dilute nitric acid.(b)Name two metals which can, however, liberate hydrogen gas from very dilute nitric acid.
- What is formed when zinc reacts with sodium hydroxide?(a) Zinc hydroxide and sodium (b) Sodium zincate and hydrogen gas(c) Sodium zinc-oxide and hydrogen gas(d) Sodium zincate and water
- Generally, metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?H2SO4HClHNO3All of these
- The atoms of which of the following pair of elements are most likely to exist in free state ?(a) hydrogen and helium (b) argon and carbon (c) neon and nitrogen (d) helium and neon
- A set of metals in order of their increasing chemical reactivity is given below : silver, copper, lead, iron, zinc, magnesium and sodium.Which of the above metals is stored in kerosene ?Which metals will react with cold water ?Which gas will be liberated when metals react with cold water ?Which of the metals will react with oxygen when heated ?Which of the metals become black in the presence of hydrogen sulphide ?
- Hydrogen and oxygen combine in the ratio of 1: 8 by mass to form water. What mass of oxygen gas would be required to react completely with 3 g of hydrogen gas?
- Translate the following statements into chemical equations and then balance them.(a) Hydrogen gas combines with nitrogen to form ammonia.(b) Hydrogen sulphide gas burns in air to give water and sulphur dioxide.(c) Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.(d) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.
- A salt X is formed and a gas is evolved when ethanoic acid reacts with sodium hydrogen carbonate. Name the salt X and the gas evolved. Describe an activity and draw the diagram of the apparatus to prove that the evolved gas is the one which you have named. Also, write a chemical equation of the reaction involved.
- Gas A, which is the major cause of global warming, combines with hydrogen oxide B in nature in the presence of an environmental factor C and a green material D to form a six carbon organic compound E and a gas F. The gas F is necessary for breathing.(a) What is gas A?(b) What is the common name of B?(c) What do you think could be C?(d) What is material D? Where is it found?(e) Name the organic compound E.(f) What is gas F? Name the natural process during which it is released.
- What happens when ferrous sulphate crystals are heated?(a) A gas having the smell of burning sulphur is evolved(b) No gas is evolved(c) Brown coloured gas is evolved(d) Colourless and odourless gas is evolved.
- Which inert gas electron configuration do the Cl atoms in Cl2 molecule resemble? What is this electron configuration?
- Metals generally react with dilute acids to produce hydrogen gas. Which one of the following metals does not react with dilute hydrochloric acid?MagnesiumAluminiumIronCopper
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